Typewriter eraser



Oct. l1, 1938. v 'F'. c. scHNABI. 2,132,906 v TYPEWRITER ERASER A Filed March, 11, 1938 4 Sheets-Sheet 1 N-V- I 'I'. Ehm-N.

A #omega h I l Inventor Oct. 1l, 1938.

F. c. scHNABEL 2,132,906

TYPEWRITER ERASER File uarch 11, 1938 4 sheets-sheet 2y Attorneys Oct. 1.1, 193s. f F. C. SCHNABEL 2,132,906

' v TYPEWRITER ERASER Filed I larch 11, 1938 4 Sheets-Sheet 3 Inventor' A 'A iorncys Y Oct. ll, 1938. F. c. scHNABEl.

' TYPEWRITER ERASER Filed March 11,'1938 Q 4 Sheets-Sfheet 4 Attorneys I Patented oef. 11,1938 A UNITED STATES.

PATENT oFEicE The present invention relates to new and useful improvements in typewriter erasers and has for one of its important objects to provide, in

a manner as hereinafter set forth, a device of this character which is adapted to be perma-l nently attached'to a machine and through the medium of which erasures may be expeditiously and neatly made with the paper on the platen.

,Another very important object of the invention is to provide a device of the. aforementioned character embodying novel means for holding and adjusting the eraser elements.

- Other objects of the invention are to provide a typewriter eraser of the character described which will be comparatively simple in construction, strong, durable, highly emcient and reliable in use, compact and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views. and wherein:

Figure 1 is a view in front elevation of an embodiment of the invention.

Figure 2 is a vertical sectional view through the invention, taken substantially on the line 2 2 of Fig. 1.

Figure 3 is a view in horizontal section, taken substantially on the line 3-3 of Fig. 2.

Figure 4 is a detail view in perspective of one of the vertical guides.

Figurev 5 is a detail view in `perspective of one of the vertically reciprocating eraser supporting bars.

Figure 6 is a detail view in-perspective ofone of the discharge chutes or conduits.

Figure 'l is a perspective view of an intermediateportion of the key lever supporting shaft.

Figure 8 is a view in horizontal section through one of the vertically reciprocating bars and its guides.

Figure 9 is a view in vertical longitudinal section through what may be referred toas the head of the device.

Figure 10 is a view in end elevation of the portion'of the invention shown in Fig. 9.

Figure 11 is a vertical sectional view, taken substantially on the line II-Ii of Fig. 9.

Figure 12 is a perspective view of the casing constituting a part ofthe head. y

Figure 13 is a detail view in .perspective of the slidably removable cover for the casing shown in Fig. 12.

Figure liisadetailviewintopplanoftwo elements of the head assemb Figure 15 is a top plan view of the eraser element and its holder.

Referring now to the drawings in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a pair of horizontal, transversely extending upper vand lower plates I and 2, respectively, which may be .attached to a typewriting machine in any suitable manner. 'I'he reference numeral 3 designates the usual platen of a typewriter. Mounted on arms 4 in spaced relation to the lower plate 2 is a transverse'rod 5. The end portions of the rod 5 are provided with reduced portions' I (see Fig. 7). lMounted on the typewriting machine, adjacent the sides thereof, are erasing units which are designated lgenerally by the reference numeral 1. As the units 1 are identical in construction and operation a detailed description of one will suffice for both.

Each unit 1 includes a pair of vertical, grooved guides 8 which are secured in position on the typewriting machine by any suitable means, as at l. Mounted for vertical sliding movement in the pair of guides I is a metallic bar I0 having tongues il on its edges engaged in the grooves of said guides I. 'I'he lower end portion I2 of the bar lil is twisted a quarter of a turn, as at I3.

'Ihe lower end of the vertically sliding bar Il is connected by .a coil spring Il to the plate '2. The coil spring il yieldingly resists upward movement of the bar Il. The reference numeral I5 designates a key lever which is Vjournalled, at

an intermediate point, on the reduced portion 6 of the rod l for swinging movement in a vertical plane. One end portion of the key lever i5 is coupled to the lower end portion ofthe bar i0 by a pin and slot connection Il. l

Mounted on the upper end of the bar ill is a head assembly which is designated generally by the reference numeral I1.' 'Ihe head I1 -comprises a casing I I of suitable material which, as

illustrated to advantage in Pig. l2 of the drawings. is open at its top and forward end. Longitudinal tongues Il are formed in the opposed sides of the casing Il. 'Ihe top of the casing Il is adapted to be closed by a removable sliding closure 20 l having tongues 2| on its longitudinal edges.

Channels 22 are provided in the upper portion of the casing II for the reception of the tongues 2|. Risingfromthe closure 2l 'at an intermediate point is a transverse operating rib 2l. The casing I8 is rigidly secured on the vertical bar Il lthrough the medium of. brackets 2|.

Mounted for sliding adjustment in the casing |8 is a sleeve 25 of polygonal cross section conforming substantially to the cross sectional shape of said casing I8. The sleeve 25 has formed longitudinally on its sides grooves 26 which receive the tongues I8 on thecasing I8. Thisis shown to advantage in Fig. 11 of the drawings. The top of the sleeve 25 is formed by means including a pair of slidable plates 21 and 28 which are hingedly connected, as at 29. Tongues 30 (see Fig. 14) are provided on the longitudinal edges cf the elements21 and 28 for sliding engagement in grooves which are provided therefor in the upper portions of the opposed side walls of the main body of the sleeve 25 (see Fig. 11) .l

-The sleeve 25 is for the reception of an eraser element 3i. One end portion of the element 3| is enclosed in a metallic holder 32 in the form of a cup or socket member. The holder 32 has pressed into its side walls vertical ribsy for anchoring the eraser element 3|, said pressed ribs providing grooves 33 in said holder for slidably receiving complemental tongues on the sides of the sleeve 25. Threadediy mounted in the rear end 35 of the casing I8 is a feed screw 36 for the eraser 3|, said serew having an operating head 31 on its outer end. 'Ihe inner end of the screw 36 is rotatably connected to the adjacent end 34 of the sleeve 25.-

'I'he reference numeral 39 designates a discharge chute or tube which is mounted vertically beneath the eraser element 3| and secured to'the plates and 2 through the medium of brackets or the 1ikev40. 'I'he discharge tube 39 comprises an enlarged or ared upper end portion 4 I. This isshown to advantage in Fig. 2 of the drawings. It is thought that the operation of the device will be readily apparent from a consideration of the foregoing. When an erasure is to se made, the platen 3 of the machine, with the work thereon, is shifted to a position'wherein the erasure to be made is in vertical alignment with the free end of either oi the elements 3|. The respective lever I5 is then depressed, as suggested in broken lines in Fig. 2 ef thedrawings, thereby elevating the respective bar I against the tension of its coil spring I4, thus bringing the element 3l int-o operative engagement with the work. as --also shown to advantage in Fig. 2 of the drawings. Then, by oscillatingor rocking the key lever I5, thereby reciprocating the bar le, the erasure may be made in an expeditiousmanner. 'Wham-the key lever I is released the spring Il retulrns the parts to inoperative position. Any dust, rubber,

mageos etc., resulting from the erasure as it is made falls into and is conveyed downwardly by the tube 38 thus preventing it from getting en the mechanism o! the typewriting machine.

As wear on the eraser elements 3| occurs it may be-compensated for by adjusting said elements outwardly through the medium oi' the screws 23. Then, the eraser elements 3| may be removed for replacement when necessary by removing the cover 20 from the casing I8 and 'the elements 21 and 28 from the sleeve 25. As suggested in broken lines in Fig. 9 of the drawings. the hinged element 28 may be swung upwardly after it has been drawn out of the sleeve 25 and clears said sleeve and then used as a handle or the Eike to facilitate pulling the element 21 out of the sleeve.

to be mounted'vertically on the machine adiacent the platen thereof, a bar mounted for vertical reciprocation in the guides, a coil spring connecting the lower end of the bar to the plate for yieldingly resisting upward movement of said bar, a key lever pivotally mounted at an-intermediate 'point and operatively connected, at ene end. to the lower end portion of the bar for act `ating said bar, and an eraser element mounted on the upper end of the bar and operatively engageable with the work on the platen.

2. A typewriter eraser comprising a bar adapt- 4ed to be slidably mounted on a typewriting mafrom for engagement with the -work on the platen,

and an adjusting screw threadedly mounted in the other. end of the casing and connected to the sleeve for actuating said piston.

FREDERICK C. 

